flex returns: error: identifier "yy_current_buffer" is undefined

Solution Unverified - Updated -

Issue

  • Some lex code that used to work ok on RHEL 5, now errors out on RHEL 6 with the following message:
foo.fl(101): error: identifier "yy_current_buffer" is undefined
                tmpBuff = yy_current_buffer;
  • We notice that yy_current_buffer does not exist any longer in RHEL 6.

Environment

  • Red Hat Enterprise Linux 6

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